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  • Uploader Uploaded by: Caribbean.Shark
    Date Added Added: 9mo ago
    Duration Runtime: 01 hours 45 min 54 sec
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  • Description
    And in 1869, Dmitri Mendeleev made sense of the 56 elements known at the time, showing how they related to each other in a distinct pattern. His periodic table let elements fall into "periods" according to atomic mass and valence (the power that determines how they combine 

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